51101125120 has 80 divisors (see below), whose sum is σ = 124352049888. Its totient is φ = 20135301120.

The previous prime is 51101125109. The next prime is 51101125133. The reversal of 51101125120 is 2152110115.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×51101125120² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22555 + ... + 320485.

Almost surely, 2^51101125120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51101125120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62176024944).

51101125120 is an abundant number, since it is smaller than the sum of its proper divisors (73250924768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51101125120 is an equidigital number, since it uses as much as digits as its factorization.

51101125120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298021 (or 298005 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 19.

Adding to 51101125120 its reverse (2152110115), we get a palindrome (53253235235).

The spelling of 51101125120 in words is "fifty-one billion, one hundred one million, one hundred twenty-five thousand, one hundred twenty".